What is the best place to look for IT jobs in NYC?

Dice is a good site for IT jobs. Also take a look on LinkedIn. If you have to try in-person(and also get a benefit of learning new stuff), consider attending user groups/meetings at sites like meetup.com. very often there are companies/recruiters attending these as well. You'll also build up your professional/social connections with other folks that attend these events and they might be able to referrer some jobs to you.